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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kirilovsky, Diana Serrano, Aurelio Ortega, José M. Roncel, Mercedes Guerrero, Fernando |
| Description | Author Affiliation: Roncel M ( Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla-CSIC, Sevilla, Spain. mroncel@us.es) |
| Abstract | Cytochrome c 550 (cyt c 550) is a membrane component of the PSII complex in cyanobacteria and some eukaryotic algae, such as red and brown algae. Cyt c 550 presents a bis-histidine heme coordination which is very unusual for monoheme c -type cytochromes. In PSII, the cyt c 550 with the other extrinsic proteins stabilizes the binding of Cl $^{−}$ and Ca $^{2$ + ions to the oxygen evolving complex and protects the Mn $_{4}$ Ca cluster from attack by bulk reductants. The role (if there is one) of the heme of the cyt c 550 is unknown. The low midpoint redox potential ( $E_{m}$ ) of the purified soluble form (from − 250 to − 314 mV) is incompatible with a redox function in PSII. However, more positive values for the Em have been obtained for the cyt c 550 bound to the PSII. A very recent work has shown an $E_{m}$ value of + 200 mV. These data open the possibility of a redox function for this protein in electron transfer in PSII. Despite the long distance (22 Å) between cyt c 550 and the nearest redox cofactor (Mn $_{4}$ Ca cluster), an electron transfer reaction between these components is possible. Some kind of protective cycle involving a soluble redox component in the lumen has also been proposed. The aim of this article is to review previous studies done on cyt c 550 and to consider its function in the light of the new results obtained in recent years. The emphasis is on the physical properties of the heme and its redox properties. This article is part of a Special Issue entitled: Photosynthesis Research for Sustainability: from Natural to Artificial. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 8 |
| Volume Number | 1817 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-08-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Cytochrome c Group Physiology Photosynthesis Amino Acid Sequence Chemistry Electron Spin Resonance Spectroscopy Molecular Sequence Data Oxidation-Reduction Spectrophotometry, Ultraviolet Spectrum Analysis, Raman Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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